Baylis was the daughter of Johnny Craddock, who during the late 1910s and 1920s played Australian rules football for Western Bulldogs. His "bulldog tenacity" was said to have inspired the club nickname. Myrtle was raised in Sunshine, Melbourne and was still a resident of the suburb when she died in 2014.[2][3][4]
Between 1948 and 1954, Baylis made three appearances for Australia. She made her senior debut on 14 August 1948 in a 27–16 win against New Zealand at Forbury Park. This was just the second-ever netball international between Australia and New Zealand. It was also part of Australia's first-ever international tour. In 1953 she also captained Australia. In 2012, Baylis was inducted into the Australian Netball Hall of Fame.[2][3][8][11][13][14][15][16]